php - 在 php 中是否有类似 array_column 的函数用于多维数组

Question

是否有类似于array_column多维数组的功能？是否有一个函数可以将下面的第一个数组转换为第二个：

Array
(
    [0] => Array
        (
            [foodType] => fruits
            [itemID] => 1
            [itemName] => apple
        )

    [1] => Array
        (
            [foodType] => fruits
            [itemID] => 2
            [itemName] => banana
        )

    [2] => Array
        (
            [foodType] => veggies
            [itemID] => 3
            [itemName] => carrot
        )

    [3] => Array
        (
            [foodType] => veggies
            [itemID] => 4
            [itemName] => broccoli
         )

)

结果数组：

Array
(
    [fruits] => Array
        (
            [0] => Array
                (
                    [itemID] => 1
                    [itemName] => apple
                )

            [1] => Array
                (
                    [itemID] => 2
                    [itemName] => banana
                )

        )

    [veggies] => Array
        (
            [0] => Array
                (
                    [itemID] => 3
                    [itemName] => carrot
                )

            [1] => Array
                (
                    [itemID] => 4
                    [itemName] => broccoli
                 )
        )

)

标签： phparraysmultidimensional-arrayarray-column

Answer 1

不，虽然您可以制作自己的函数，只使用array_column获取类型/列，然后循环遍历您的数组，但没有一个函数可以在本机上获得您的预期输出，以匹配删除该项目以不重复迭代。

就像是：

<?php
$data = [
    ['foodType' => 'fruits', 'itemID' => 1, 'itemName' => 'apple'],
    ['foodType' => 'fruits', 'itemID' => 2, 'itemName' => 'banana'],
    ['foodType' => 'veggies', 'itemID' => 3, 'itemName' => 'carrot'],
    ['foodType' => 'veggies', 'itemID' => 4, 'itemName' => 'broccoli']
];

function array_column_multi ($array, $column) {
    $types = array_unique(array_column($array, $column));

    $return = [];
    foreach ($types as $type) {
        foreach ($array as $key => $value) {
            if ($type === $value[$column]) {
                unset($value[$column]);
                $return[$type][] = $value;
                unset($array[$key]);
            }
        }
    }
    return $return;
}


print_r(array_column_multi($data, 'foodType'));

https://3v4l.org/KQVeN

结果：

Array
(
    [fruits] => Array
        (
            [0] => Array
                (
                    [itemID] => 1
                    [itemName] => apple
                )

            [1] => Array
                (
                    [itemID] => 2
                    [itemName] => banana
                )

        )

    [veggies] => Array
        (
            [0] => Array
                (
                    [itemID] => 3
                    [itemName] => carrot
                )

            [1] => Array
                (
                    [itemID] => 4
                    [itemName] => broccoli
                )

        )

)